I am going to put that Joule Thief pic on my website. We get a lot of feedback from readers who have buit the circuits but few get around to actually photographing their project.
.48 is good if you ask me, that's bellow a common diode drop. The cell is more than dead, the last dredges aren't worth trying to recover. Oft times recovering the first dredges aren't worth it.. But fun to see! The amount of energy required to light a red diode so you can see it in low lighting are incredibly low, the amount required to do something more useful goes up very quickly.
You'd need a solid performing scope to investigate a Joule Thief, their frequency is relatively low often in the audio to 200khz range, but the rise and fall times are not sine waves so you need a scope with a good 10-20mhz to really get a good look at them functioning.
You made me laugh good saying that!i do it for the freedom of all electrons
This is very interesting. I'd like to discuss this circuit from a different perspective, desulphating lead acid batteries.
It is claimed by some, including by commercial manufacturers, that pulse charging can reverse desulphation. I have tried commercial units and there does seem to be some improvements in the batteries.
ZAP
thanks
I am going to put that Joule Thief pic on my website. We get a lot of feedback from readers who have buit the circuits but few get around to actually photographing their project.
Mosaic.... This has been gone over endlessly on forums both here and on the web in general. There is no way to desulfate a battery fully. You can jog it back to life but this is BRIEF and the subsequent failure is absolute and irreversibly worse over time, the entire battery would have to be rendered down into it's constitute components and reconstructed, which is what they already do!
If you look at the chemistry involved in sulfation that eventually kills all Lead Acid batteries can't be reversed electrochemically.
The only possible sollution to avoiding sulfation of Lead Acid cells is to never use them and keep them at a universally perfect float charge forever. This is obviously not practical. Any use of a lead acid battery over time regardless of any methods to prevent it will eventually end in sulfation failure. It is a fact of the chemistry.
Your photo had extra components and it would have confused the issue for those beginners making the project. Things have to be simple and easy to understand. The project is already a very sophisticated and complex design.colin!!, why didn't you post mine when I made it 3 years ago!
What kind of frequency and power per pulse did u deliver to the battery?
Excellent link voidptr, goes to show you that even though most hobbyists and many persons that have gone through professional engineering schools learn and know the details of the electrical side of things, that it is not always easy to come up with an efficient solution to a specific problem.
I'm sorry but all this post does it to show that you know nothing of the chemistry involved and the realities of what occurs the the materials that make up a lead acid battery age over time.While I appreciate your advice, what cannot be done today and is impossible and is a 'fact' , often becomes be quite doable and run of the mill with a bit if ingenuity.
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